code: func (s *Filesystem) StateSnapshotMeta() SnapshotMeta {
  	if s.file == nil {
  		return SnapshotMeta{} // placeholder
  	}
  
  	return SnapshotMeta{
  		Lineage: s.file.Lineage,
  		Serial:  s.file.Serial,
  
  		TerraformVersion: s.file.TerraformVersion,
  	}
  }
docs: // StateSnapshotMeta returns the metadata from the most recently persisted
  // or refreshed persistent state snapshot.
  //
  // This is an implementation of PersistentMeta.