[Samba] Allow only one computer SMB v1

[miguel medalha]

>> I have met that problem with some scanners. I solved it by scanning to FTP instead of scanning to a share. Fast and effective. Isn't that an option for you?

> It could be an option.  Just have never been a fan of the security that 
> FTP affords.  Not that SMBv1 is much better.

Of course it depends on how sensitive your scanned documents are. In my case FTP is alright, the scanned material is simple everyday office work.