This makes sure fsdiff doesn't try to unmount things that shouldn't be. **Note**: This is intended as a temporary solution to have as minor a change as possible for 1.11.1. A bigger change will be required in order to support container re-attach. Signed-off-by: Brian Goff <cpuguy83@gmail.com> Upstream-commit: 7342060b070df67481f8da4f394a57cac1671d56 Component: engine