/usr/share/doc/php-sabre-dav/examples/ is in php-sabre-dav 1.8.12-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/php-sabre-dav/examples/addressbookserver.php
/usr/share/doc/php-sabre-dav/examples/basicauth.php
/usr/share/doc/php-sabre-dav/examples/calendarserver.php
/usr/share/doc/php-sabre-dav/examples/digestauth.php
/usr/share/doc/php-sabre-dav/examples/fileserver.php
/usr/share/doc/php-sabre-dav/examples/groupwareserver.php
/usr/share/doc/php-sabre-dav/examples/simplefsserver.php
/usr/share/doc/php-sabre-dav/examples/sql/
/usr/share/doc/php-sabre-dav/examples/sql/mysql.addressbook.sql
/usr/share/doc/php-sabre-dav/examples/sql/mysql.calendars.sql
/usr/share/doc/php-sabre-dav/examples/sql/mysql.locks.sql
/usr/share/doc/php-sabre-dav/examples/sql/mysql.principals.sql
/usr/share/doc/php-sabre-dav/examples/sql/mysql.users.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.addressbook.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.calendars.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.locks.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.principals.sql
/usr/share/doc/php-sabre-dav/examples/sql/pgsql.users.sql
/usr/share/doc/php-sabre-dav/examples/sql/sqlite.addressbooks.sql
/usr/share/doc/php-sabre-dav/examples/sql/sqlite.calendars.sql
/usr/share/doc/php-sabre-dav/examples/sql/sqlite.locks.sql
/usr/share/doc/php-sabre-dav/examples/sql/sqlite.principals.sql
/usr/share/doc/php-sabre-dav/examples/sql/sqlite.users.sql
/usr/share/doc/php-sabre-dav/examples/webserver/
/usr/share/doc/php-sabre-dav/examples/webserver/apache2_htaccess.conf
/usr/share/doc/php-sabre-dav/examples/webserver/apache2_vhost.conf
/usr/share/doc/php-sabre-dav/examples/webserver/apache2_vhost_cgi.conf