If you'd like to set quota on a volume - Not with the certified commands.
You'd need to clone the ResizeQtreeQuota and make some changes to it.
We have not encountered a use case for it in the past.
In the CreateQtree command or the ResizeQtreeQuota you can set a quota on a qtree within a volume.
It will set a type "tree" quota.
Note that in 1.0.1 we pushed those quota parameters (DiskLimit and FileLimit) into the qtree object.
The Auto upgrader will take care of that.
Yaron