Starting point, problems listing Samba content

Hi all,
I am at the starting point, I’m following the instructions but have found several issues:

-the machine with the samba port opened is not as written on the instructions, but is

Nmap scan report for
Host is up (0.050s latency).
Not shown: 989 filtered ports
53/tcp open domain
88/tcp open kerberos-sec
135/tcp open msrpc
139/tcp open netbios-ssn
389/tcp open ldap
445/tcp open microsoft-ds
464/tcp open kpasswd5
593/tcp open http-rpc-epmap
636/tcp open ldapssl
3268/tcp open globalcatLDAP
3269/tcp open globalcatLDAPssl

-when I do smbclient -N -L ////
there are no folders listed:

smbclient -N -L ////

Anonymous login successful

    Sharename       Type      Comment
    ---------       ----      -------

Reconnecting with SMB1 for workgroup listing.
do_connect: Connection to failed (Error NT_STATUS_RESOURCE_NAME_NOT_FOUND)
Unable to connect with SMB1 – no workgroup available

Could you help me?