1-Check on the dataset if you set Windows ACL and who is the owner user and group.
2-check on the smb share, there is a checkbox to set acls recursivly for windows acl. (Only once)
3-either you make your user member of the owner group on dataset or you can log in the first time with root account (by default is the owner when a dataset is created) and use windows to set permision for your user as you do normaly with windows folders and files.
4-from cmd in windows you can use : net use command to check if any credentials are stored for accesing your server.
If you are not in AD eviroment doesnt mater fqdn or netbios or ip. Just use the same way allways because for windows \\servername and \\serverip are different locations and will promt for credentials