/usr/ is in php-mapi 8.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/php/
/usr/lib/php/20170718/
/usr/lib/php/20170718/mapi.so
/usr/share/
/usr/share/doc/
/usr/share/doc/php-mapi/
/usr/share/doc/php-mapi/copyright
/usr/share/kopano/
/usr/share/kopano/php/
/usr/share/kopano/php/mapi/
/usr/share/kopano/php/mapi/class.baseexception.php
/usr/share/kopano/php/mapi/class.baserecurrence.php
/usr/share/kopano/php/mapi/class.freebusypublish.php
/usr/share/kopano/php/mapi/class.mapiexception.php
/usr/share/kopano/php/mapi/class.meetingrequest.php
/usr/share/kopano/php/mapi/class.recurrence.php
/usr/share/kopano/php/mapi/class.taskrecurrence.php
/usr/share/kopano/php/mapi/class.taskrequest.php
/usr/share/kopano/php/mapi/mapi.util.php
/usr/share/kopano/php/mapi/mapicode.php
/usr/share/kopano/php/mapi/mapidefs.php
/usr/share/kopano/php/mapi/mapiguid.php
/usr/share/kopano/php/mapi/mapitags.php
/usr/share/doc/php-mapi/changelog.Debian.gz