title: redux-persist - how to whitelist nested state field?
body: <p>I want to save in storage one full reducer, and only one field from other reducer. How can I do this? I found e.g. <a href="https://github.com/rt2zz/redux-persist/issues/277" rel="nofollow noreferrer">this gh issue</a>, but all attempts (from gh link and other sources) turned out to be a failure.</p>
  <p><a href="https://codesandbox.io/s/focused-fermi-obs1g?file=/src/index.js" rel="nofollow noreferrer">codesandbox example</a></p>
  <pre><code>const persistConfig = {
    key: &quot;root&quot;,
    storage,
    whitelist: [&quot;first&quot;],
    transforms: [createWhitelistFilter(&quot;second&quot;, [&quot;counter&quot;])]
  };
  </code></pre>
  <p>It works for <code>first</code> reducer, nothing happens with the second, when I want to storage only <code>counter</code> field from reducer.</p>
  <p>Any Ideas?</p>