ASUS are another one.
Currently shipping "top of the line" ASUS routers are being shipped with firmware that includes Samba 3.0.33, which is a decade old for crying out loud, riddled with security bugs, and supports only SMB1 (which is being deprecated everywhere, fast). And ASUS have no plans to update their current (let alone legacy) products to a modern, (more) secure version of Samba, such as Samba 4.
You can use third-party firmware alternatives for the ASUS routers that do include a more recent version of Samba 3, which would at least get you SMB2 support, but apparently the devices don't have enough flash storage to allow Samba 4 to be included.
So please, give ASUS routers a very wide berth as ASUS don't give a fsck about basic security, or their users. Alternatively, disable the outdated and insecure ASUS Samba server entirely, and use something else (Raspberry Pi3+?) for your Samba file sharing.