The ksmbd-server doesn’t support by official firmware. Run software from Openwrt team will lead to Error: unresolve netlink family. , which made it not available for accessing.
If you use smbd, the only options you could choose is SMB1 due to negotiation protocol will fail if you even set min protocol = SMB2_02 on the server.
Wireshark:
The response will always be NO_PROTOCOL_SUPPORTED if you set to use SMB2.
Please made this device subtarget available so I could compile by myself.