/usr/ is in php-symfony-filesystem 2.7.10-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/php/
/usr/share/php/Symfony/
/usr/share/php/Symfony/Component/
/usr/share/php/Symfony/Component/Filesystem/
/usr/share/php/Symfony/Component/Filesystem/LockHandler.php
/usr/share/php/Symfony/Component/Filesystem/Filesystem.php
/usr/share/php/Symfony/Component/Filesystem/autoload.php
/usr/share/php/Symfony/Component/Filesystem/Exception/
/usr/share/php/Symfony/Component/Filesystem/Exception/FileNotFoundException.php
/usr/share/php/Symfony/Component/Filesystem/Exception/ExceptionInterface.php
/usr/share/php/Symfony/Component/Filesystem/Exception/IOExceptionInterface.php
/usr/share/php/Symfony/Component/Filesystem/Exception/IOException.php
/usr/share/doc/
/usr/share/doc/php-symfony-filesystem/
/usr/share/doc/php-symfony-filesystem/copyright
/usr/share/doc/php-symfony-filesystem/changelog.Debian.gz
/usr/share/doc/php-symfony-filesystem/README.md
/usr/share/doc/php-symfony-filesystem/README.Debian