title: validating deep fields in redux-from
body: <p>I have wizard redux-from and my fields are something like this:</p>
  
  <pre class="lang-js prettyprint-override"><code>&lt;Field
      component={TextField}
      className="mui-textfield"
      floatingLabelText="title"
      name="data.title"
      fullWidth={true}
  /&gt;
  </code></pre>
  
  <p>so I want to validate the form with validate function, </p>
  
  <p><strong>Question:</strong></p>
  
  <p>how can I do this work?</p>
  
  <p>Thanks</p>