Try to added in /etc/fstab something like this if you are using guest account:
//192.168.1.209/public /media/NAS cifs guest,uid=1000,iocharset=utf8 0 0
→ Source.
Or like this if you have to authorize yourself:
//server/share /pathto/mountpoint cifs credentials=/home/username/.smbcredentials,uid=shareuser,gid=sharegroup 0 0
With .smbcredentials file in your home directory:
username=shareuser
password=sharepassword
domain=domain_or_workgroupname
→ Source.
Do not forget to rescan it periodically, e.g. via OS cronjob:
Otherwise it will be updated only when you accessing it.