Nfsroot .zfs/snapshot mounted on different mount?

[John]

Hi Folks,

   I ran into something today I didn't expect and was wondering
how it is accomplished - or something is going on in the NFS
code I've never seen.

   I have some remote nfs booted systems where the OS lives
on ZFS volumes (the client is linux):.

10.121.56.21:/vol/nfsbt_sysgpu01   100G  4.7G   96G   5% /

   After installing the latest gpu drivers I was asked to
compare a few things and went into the /.zfs/snapshot directory
as typical. However, I then noticed a 2nd nfs mount had
appeared:

10.121.56.21:/vol/nfsbt_sysgpu01/.zfs/snapshot/rb_20180727-185554_drivers  100G  4.7G   96G   5% /.zfs/snapshot/rb_20180727-185554_drivers

   To my knowledge, I have no auto-mounter that could have done
the mount. I'm curious where this is hooked in.

   The server is:

FreeBSD 11.1-STABLE #11 r327104: Sat Dec 23 08:19:22 EST 2017

   with standard nfsv3 exports. Other than this curiousness
the system is flawless.

Thanks,
John
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