3.2.4.1.9 Compressing the Message
If IsCompressionSupported is TRUE and Connection.CompressionIds is not empty, the client SHOULD<121> compress the message as specified in section 3.1.4.4 if one of the following conditions is satisfied.
CompressAllRequests is TRUE.
Application requested to compress SMB2 WRITE request as specified in section 3.2.4.7.