Snapshot restoration

can we restore the complete VM from the Netapp snapshot ?

I have provided 1 lun to that Vm - we have 30 snapshots on the storage.

the thing is OS of the VM is upgraded to newer version yesterday.

With old storage snapshots VM cant be restored to old version - am I correct ? if vm need to be restored to old version - VM level snapshot will help.

Please correct me if am wriong.