docs: def list_snapshots(domain=None, **kwargs):
      '''
      List available snapshots for certain vm or for all.
  
      :param domain: domain name
      :param connection: libvirt connection URI, overriding defaults
  
          .. versionadded:: 2019.2.0
      :param username: username to connect with, overriding defaults
  
          .. versionadded:: 2019.2.0
      :param password: password to connect with, overriding defaults
  
          .. versionadded:: 2019.2.0
  
      .. versionadded:: 2016.3.0
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' virt.list_snapshots
          salt '*' virt.list_snapshots <domain>
      '''
      ret = dict()
      conn = __get_conn(**kwargs)
      for vm_domain in _get_domain(conn, *(domain and [domain] or list()), iterable=True):
          ret[vm_domain.name()] = [_parse_snapshot_description(snap) for snap in vm_domain.listAllSnapshots()] or 'N/A'
  
      conn.close()
      return ret