Samba is a implementation of the SMB/CIFS networking protocol that is used by Windows devices to provide shared access to files, printers, and serial ports etc.

Install samba

sudo apt install samba samba-common-bin smbclient cifs-utils

Modify smb.conf to use WINS settings from DHCP ? N

Create the public shared folder

sudo mkdir /home/shares
sudo mkdir /home/shares/public

Change owner, group and permission

sudo chown -R root:users /home/shares/public
sudo chmod -R ug=rwx,o=rx /home/shares/public

Edit the /etc/samba/smb.conf

sudo nano /etc/samba/smb.conf

Add security = users just after ##### Authentification #####.

Change workgroup = WORKGROUP with yours.

After [homes] change read only to no.

Add the following at the end of the file.

[public]
   comment = Public
   path = /home/shares/public
   valid users = @users
   force group = users
   create mask = 0600
   directory mask = 0771
   read only = no

Restart the samba service

sudo /etc/init.d/smbd restart

Add pi as smb user

sudo smbpasswd -a pi