/usr/sbin/ganeti-cleaner is in ganeti 2.15.2-7+deb9u3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/sbin/../lib/ganeti/default/usr/sbin/ganeti-cleaner
/usr/sbin/../lib/ganeti/default/usr/sbin/ganeti-cleaner