https://bugzilla.redhat.com/show_bug.cgi?id=1034095
--- Comment #6 from Alexander Larsson alexl@redhat.com --- It seems like we should be able to match on the backing file, but:
SUBSYSTEM=="block", NAME=="loop*", ATTR{loop/backing_file)=="/var/lib/docker/*", ENV{UDISKS_IGNORE}="1"
doesn't seem to work.