Sigh. So copying and pasting commands from the internet doesn't solve my problem. This means I'm going to have to actually try and /understand/ what's wrong. I didn't sign up for this.
@hl@xdydx#FreeBSD has only support for SMBv1, which you should absolutely avoid for security reasons, although you can probably configure #samba to still allow it ... but ... don't. Nowadays I'd prefer to say FreeBSD does not support mounting SMB shares.
There are some ports available implementing "modern" SMB (v2/v3) on top of #fuse, which might be an option, but in my experience, they're not perfectly reliable and performance isn't the greatest either.
If ever possible, work on the server side and see whether you can share via #NFS instead. Either #NFSv3 (which is only "secure" as long as your network is perfectly secure and you control all participating machines, but at least it doesn't pretend to do anything else), or #NFSv4 with #kerberos security.