/usr/ is in libatk-adaptor 2.18.1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/gtk-2.0/
/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/
/usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libatk-bridge.so
/usr/lib/gnome-settings-daemon-3.0/
/usr/lib/gnome-settings-daemon-3.0/gtk-modules/
/usr/lib/gnome-settings-daemon-3.0/gtk-modules/at-spi2-atk.desktop
/usr/lib/unity-settings-daemon-1.0/
/usr/lib/unity-settings-daemon-1.0/gtk-modules/
/usr/lib/unity-settings-daemon-1.0/gtk-modules/at-spi2-atk.desktop
/usr/share/
/usr/share/doc/
/usr/share/doc/libatk-adaptor/
/usr/share/doc/libatk-adaptor/NEWS.gz
/usr/share/doc/libatk-adaptor/copyright
/usr/share/doc/libatk-adaptor/README
/usr/share/doc/libatk-adaptor/changelog.Debian.gz