Folder Permissions with Samba

Good evening guys.

I have a file server in linux, which is consumed in Windows. Each department has its own folder (and everyone uses a public folder), and I need only the user of that department to be able to access their folder (no problem it is visible to other users).

I did the following procedure:

When I access the server via ip (for example \ 192.168.1.100/Files) in windows explorer, I have the desired result, ie the user that is logged in (that I typed the username and the password) will have only access your folder. However, if I map the server address with net use, all folders are freed (net use Z: \ 192.168.1.100 \ files / user: username password).

I made several changes in smb.conf to try to get around this and I have no idea how to fix this.

I'll put snippets of my smb.conf

[global]
    workgroup = SAMBA
    security = user
    valid users = adm ##Já coloquei o nome de todos os usuarios aqui para testar
    passdb backend = tdbsam
    wins support = yes
    netbios name = NomeExemplo
    map to guest = bad user
    guest account = nobody

[Arquivos]
    path = /mnt/Arquivos
    writable = yes
    guest ok = yes
    admin users = adm
    write list = adm
    browseable = yes
    guest only = yes

[Pasta Setor1]
    path = /mnt/Arquivos/Pasta Setor1
    valid users = usuario1
    write list = usuario1
    public = no
    browseable = yes
    writable = yes

[Pasta Setor2]
    path = /mnt/Arquivos/Pasta Setor2
    valid users = usuario2
    write list = usuario2
    public = no
    browseable = yes
    writable = yes

[Pasta Publica]
    path = /mnt/Arquivos/Pasta Publica
    comment = Pasta Publica
    public = yes
    browseable = yes
    writable = yes

Thanks for the help if anyone has already experienced this or thinks there is something wrong with smb.conf