/usr/share/php/ is in libphp-phpmailer 5.2.14+dfsg-2.3+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/libphp-phpmailer/
/usr/share/php/libphp-phpmailer/PHPMailerAutoload.php
/usr/share/php/libphp-phpmailer/autoload.php
/usr/share/php/libphp-phpmailer/class.phpmailer.php
/usr/share/php/libphp-phpmailer/class.phpmaileroauth.php
/usr/share/php/libphp-phpmailer/class.phpmaileroauthgoogle.php
/usr/share/php/libphp-phpmailer/class.pop3.php
/usr/share/php/libphp-phpmailer/class.smtp.php
/usr/share/php/libphp-phpmailer/extras/
/usr/share/php/libphp-phpmailer/extras/EasyPeasyICS.php
/usr/share/php/libphp-phpmailer/extras/htmlfilter.php
/usr/share/php/libphp-phpmailer/extras/ntlm_sasl_client.php
/usr/share/php/libphp-phpmailer/get_oauth_token.php
/usr/share/php/libphp-phpmailer/language/
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-am.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ar.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-az.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-be.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-bg.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-br.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ca.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ch.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-cz.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-de.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-dk.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-el.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-eo.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-es.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-et.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-fa.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-fi.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-fo.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-fr.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-gl.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-he.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-hr.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-hu.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-id.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-it.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ja.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ka.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ko.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-lt.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-lv.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ms.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-nl.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-no.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-pl.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-pt.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ro.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ru.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-se.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-sk.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-sl.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-sr.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-tr.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-uk.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-vi.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-zh.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-zh_cn.php