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I've got the same flood here, on port 445, across my LAN. If I block that port, I get a flood instead via port 139.
There was 1MB/s upload/download between my Windows 10 machine and a Raspberry Pi 3 (4.9.24-v7+).
I blocked that and had the same flood between two Raspberry Pi 3s.
The same thing happened if I fired up my Lubuntu boxes (I can't remember if it was the 4.4.0-75-generic or the 4.8.0-29-generic, and I can't re-enable Samba right now on the network, as it's "live" and I don't want to disrupt the web service).
Have had to temporarily block all 139/445 Samba traffic on all networked machines, just allowing 139 and 445 from my Windows 10 machine, which is tolerable, as I need to be able to access network shared folders.
I've attached a screenshot from Wireshark, and I also have the .pcapng capture file if needed.