Just pulled this kernel commit...

commit 7d6beb71da3cc033649d641e1e608713b8220290
Merge: aa8e3291729f f69e8091c4a2
Author: Linus Torvalds <torvalds@???>
Date: Tue Feb 23 13:39:45 2021 -0800

<snip>

       - Idmapped mounts make it possible to easily share files between
         multiple users or multiple machines especially in complex
         scenarios. For example, idmapped mounts will be used in the
         implementation of portable home directories in
         systemd-homed.service(8) where they allow users to move their                home
         directory to an external storage device and use it on multiple
         computers where they are assigned different uids and gids. This
         effectively makes it possible to assign random uids and gids at
         login time.

<snip>

I remember the question regarding implementation of migratory home directories raising it's head in the past. We now have the answer.



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