> Can I mark my filesystem as not NFS exportable (by design) and not
> implement that funcationality?

Well, if your fhtovp and vptofh methods do nothing but return
EOPNOTSUPP, NFS export attempts certainly won't actually _work_.  I
think it may be enough for your checkexp method to return EOPNOTSUPP,
but when I did a filesystem, I had all three return EOPNOTSUPP.

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