Currently in the stretch backports version of systemd there is a nasty bug that will break ecryptfs mounts (took me awhile to track it down as I thought it was an ecryptfs issue). Some people use ecryptfs for full home directory encryption so this bug has the potential to be quite nasty. Would be nice if this bugfix could be put into backports:
https://github.com/systemd/systemd/pull/6286Thanks for your time.