samba - May 2011 - Quota support in samba

Hi,

Is there any document which talks about quota implementation in samba?
And can anyone suggest a good technical document for samba which cover
\$Extend\$Quota:$Q:INDEX_ALLOCATION functionality? when is it accessed and
what is it for?

Is there any way by which we can set/get 'quota' property of samba
shares
from windows client?


Thanks and regards,
Santanu