i am using manila and generic driver with dhss true, but cannot create snapshot from shares, any help? where can i look at?

(cinder backend is a linux nfs server)

thank you 

$ manila snapshot-create share-01 --name Snapshot1
ERROR: Snapshots cannot be created for share '2c8b1b3d-ef82-4372-94df-678539f0d843' since it does not have that capability. (HTTP 422) (Request-ID: req-cab23a46-37dc-4f2b-b26c-d6b21b7453ba)