/usr/lib/pyshared/python2.7/samba/messaging.so is in python-samba 4.0.0~alpha18.dfsg1-4ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.7/samba/../../../python2.7/dist-packages/samba/messaging.so