docs: def get_instance_volumes(instance_detail, check_names):
      """
      Extracts the mount points and mapped directories or names of a Docker container.
  
      :param instance_detail: Result from a container inspection.
      :type instance_detail: dict
      :param check_names: Whether to check for named volumes.
      :type check_names: bool
      :return: Dictionary of volumes, with the destination (inside the container) as a key, and the source (external to
       the container) as values. If ``check_names`` is ``True``, the value contains the mounted volume name instead.
      :rtype: dict[unicode | str, unicode | str]
      """
      if 'Mounts' in instance_detail:
          if check_names:
              return {m['Destination']: m.get('Name') or m['Source']
                      for m in instance_detail['Mounts']}
          return {m['Destination']: m['Source']
                  for m in instance_detail['Mounts']}
      return instance_detail.get('Volumes') or {}