trimming of chroot jail path in df(1)

[Alexandr Kovalenko]

[Please Cc: me]

I've found module jailfsstat:

http://garage.freebsd.pl/jailfsstat.tgz

which task is that process in jail can see only file systems mounted
inside of jail.

It works somehow incorrect and I would like to ask you for an URL of
FreeBSD's vfs implementation documentation.

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