All affected manual pages talked about trailing slash despite the tools prepend the slash.
In addition, quota(1) mentioned setquota(1).
Attached patch fix it.
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Actually I hit this problem when somebody reported issue with NFSv4 mounted from ONTAP, release 7.3.4, produced by NetApp Inc (https://bugzilla.redhat.com/show_bug.cgi?id=668973). I'm not sure it's worth-noting into quota manual or other documentation this RPC quota implementation is affected.