/usr/ is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/sbin/
/usr/sbin/ubuntu-touch-lightdm-session
/usr/bin/
/usr/bin/create-online-accounts
/usr/bin/ubuntu-touch-session
/usr/share/
/usr/share/lightdm/
/usr/share/lightdm/sessions/
/usr/share/lightdm/sessions/ubuntu-touch.desktop
/usr/share/lightdm/lightdm.conf.d/
/usr/share/lightdm/lightdm.conf.d/52-ubuntu-touch.conf
/usr/share/doc/
/usr/share/doc/ubuntu-touch-session/
/usr/share/doc/ubuntu-touch-session/copyright
/usr/share/doc/ubuntu-touch-session/changelog.Debian.gz
/usr/share/ubuntu-touch-session/
/usr/share/ubuntu-touch-session/usc-wrapper
/usr/share/upstart/
/usr/share/upstart/sessions/
/usr/share/upstart/sessions/pulseaudio.conf
/usr/share/upstart/sessions/xdg-dirs.conf
/usr/share/upstart/sessions/ofono-setup.conf
/usr/share/upstart/sessions/maliit-server.conf
/usr/share/upstart/sessions/pulseaudio-trust-stored.conf.moved
/usr/share/upstart/sessions/indicator-sound.override
/usr/share/upstart/sessions/pulseaudio-trust-stored.conf
/usr/share/upstart/sessions/cameraservice-trust-stored.conf
/usr/share/upstart/sessions/cameraservice-trust-stored.conf.moved
/usr/share/upstart/sessions/obexd.conf
/usr/share/upstart/sessions/bluez-mpris-proxy.conf
/usr/share/pam-configs/
/usr/share/pam-configs/touch-extrausers