From Samba 4.4.0 release notes:
"SMB3 Multi-Channel - Samba 4.4.0 adds *experimental* support for SMB3 Multi-Channel. Multi-Channel is an SMB3 protocol feature that allows the client to bind multiple transport connections into one authenticated SMB session. This allows for increased fault tolerance and throughput. The client chooses transport connections as reported by the server and also chooses over which of the bound transport connections to send traffic. I/O operations for a given file handle can span multiple network connections this way. An SMB multi-channel session will be valid as long as at least one of its channels are up."
NAS storage device makers will probably add this as a feature the moment it becomes more stable.
This will allow Windows 8.1 and Windows 10 clients to copy files much faster with multiple ethernet cards. Look for Netgear, Synology, Freenas, and others to add this important new feature soon.
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