ansible/roles/samba/tasks/config.yaml

---
- name: Copy "{{ smb_config }}"
  template:
    src: "{{ smb_config }}"
    dest: /etc/samba/smb.conf
  become: true
  register: smbconf

- name: Restart nmbd.service
  systemd:
    name: nmbd
    state: restarted
    enabled: yes
  become: true
  when: smbconf.changed