如何从嵌套的to导航器导航到父StackNavigator？

import { createStackNavigator } from 'react-navigation';

// 子 StackNavigator
const ChildStackNavigator = createStackNavigator(
  {
    ChildScreen1: {
      screen: ChildScreen1,
    },
    ChildScreen2: {
      screen: ChildScreen2,
    },
    // ...
  },
  {
    initialRouteName: 'ChildScreen1',
  }
);

// 父 StackNavigator
const ParentStackNavigator = createStackNavigator(
  {
    ParentScreen1: {
      screen: ParentScreen1,
    },
    ParentScreen2: {
      screen: ParentScreen2,
    },
    ChildStack: {
      screen: ChildStackNavigator, // 将子 StackNavigator 作为一个屏幕添加到父 StackNavigator 中
    },
    // ...
  },
  {
    initialRouteName: 'ParentScreen1',
  }
);

this.props.navigation.navigate('ParentScreen1');