The usual syntax for mounting a Windows Share will fail with “Operation not supported” or similar.
You need an extra parameter to specify the SMB version used.
This will fail:
mkdir /mnt/freenas
mount -t cifs -o username=user, password=secret //<ip addreess of server>/share /mnt/freenas
Add the vers=3.0
Change the mount command options to include the SMB client protocol version for success:
mount -t cifs -o username=user, password=secret,vers=3.0 //<ip addreess of server>/share /mnt/freenas
e.g.
mount -t cifs -o username=nelsoj,password=strongsecret,vers=3.0 //192.168.1.100/share /mnt/freenas