> Suppose a user alice has a private file "foo" that she want to be  
> read by bob.
> She cannot
>       chgrp bob foo
> because she is not a member of bob.

this works for me:

alice% srvfs 4bob /usr/alice/4bob
alice% chmod 666 /srv/4bob

then, bob

bob% mount /srv/4bob /n/fromalice

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