"Currently" let's me hope that this feature is planned.
Since there are almost two years gone now since your answer: What's the state of implementing rquotad into open-e DSS systems?
I really think this is a required feature in today's times where many systems require remotely mounted disk space and enforce quota restrictions.
Me, for example, is running an ispconfig system which does manage quota, but it doesn't help if the underlying NFS storage software doesn't support it.