/usr/ is in libpam-smbpass 2:3.6.3-2ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/pam-configs/
/usr/share/pam-configs/smbpasswd-migrate
/usr/share/doc/
/usr/share/doc/libpam-smbpass/
/usr/share/doc/libpam-smbpass/examples/
/usr/share/doc/libpam-smbpass/examples/README
/usr/share/doc/libpam-smbpass/examples/kdc-pdc
/usr/share/doc/libpam-smbpass/examples/password-sync
/usr/share/doc/libpam-smbpass/examples/password-migration
/usr/share/doc/libpam-smbpass/examples/password-mature
/usr/share/doc/libpam-smbpass/README
/usr/share/doc/libpam-smbpass/TODO
/usr/share/doc/libpam-smbpass/copyright
/usr/share/doc/libpam-smbpass/NEWS.Debian.gz
/usr/share/doc/libpam-smbpass/changelog.Debian.gz