[Dovecot] "GETQUOTA" Working?

Using beta9, I've tried "quota = dirsize:storage=10240" and "quota =
maildir:storage=10240", but I can't seem to get the IMAP commands to
respond:

• OK Dovecot ready. a LOGIN user pass a OK Logged in. b CAPABILITY
• CAPABILITY IMAP4rev1 SORT THREAD=REFERENCES MULTIAPPEND UNSELECT
  LITERAL+ IDLE CHILDREN NAMESPACE LOGIN-REFERRALS b OK Capability completed. c GETQUOTAROOT INBOX c BAD Error in IMAP command GETQUOTAROOT: Unknown command. d GETQUOTA "" d BAD Error in IMAP command GETQUOTA: Unknown command. e LOGOUT
• BYE Logging out e OK Logout completed.

(Per http://www.faqs.org/rfcs/rfc2087.html)

Apparently "QUOTA" isn't being advertised, and none of the commands
are accepted. Any ideas?

Rich