trim discard support for ceph block device

Proxmox does support Ceph block devies (RBD) but I am not sure if there is support for trim discard yet?

I could find a discussion on the pve-devel mailing list from 2012: http://pve.proxmox.com/pipermail/pve...er/004419.html
At that time the feature was experimental so there was no conclusion. But nowadays trim is supported within recent kernel and qemu versions.

Please clarify if recent Proxmox version 3.1 does support trim discard on RBD.