SnapshotSasPermissions
 SnapshotSasPermissions contains the list of
            permissions that can be set for a blob's access policy.  Use
             SetPermissions
            to set the permissions on the  BlobSasBuilder.
            
                
All = -1
Indicates that all permissions are set.
            
Delete = 4
Indicates that Delete is permitted.
            
PermanentDelete = 16
Indicates that Permanent Delete is permitted.
            
Read = 1
Indicates that Read is permitted.
            
Indicates that setting immutability policy is permitted.
            
Write = 2
Indicates that Write is permitted.