3.3.4.5 DFS Subsystem Notifies That a Share Is Not a DFS Share
If the DFS subsystem removes its claim for a share as part of the DFS namespace, it MUST notify the CIFS server via this event. In response to this event, the CIFS server MUST clear the SMB_SHARE_IS_IN_DFS bit in the Server.Share.OptionalSupport attribute of the share.