Filtering in vaadin-grid 2

The demos for vaadin-grid 2.x don't seem to show how to do the following kind of filtering.

<vaadin-date-picker max="[[endValue]]" value="{{startValue}}" label="Start"></vaadin-date-picker>
<vaadin-date-picker min="[[startValue]]" value="{{endValue}}" label="End"></vaadin-date-picker>

<vaadin-grid items="[[items]]">
  <vaadin-grid-column>
    <template class="header">
      Date
    </template>
    <template>
      <!-- TODO Filter only the dates that are between start and end value.  -->
      [[item.date]] 
    </template>
  </vaadin-grid-column>
</vaadin-grid>

Any help? ;)

Same as OP I would also like to do interval filtering. As well as being able to filter for multiple strings (string1 | string2).

@Tomi: Filtering inside Vaadin Grid is quite fast. Would filtering outside Vaading as fast?

My case is something like this:

    <firebase-query path="/tweets" data="{{tweets}}"></firebase-query>
    <vaadin-grid id="material" items="{{tweets}}"></<vaadin-grid>

Where is the Vaadin Filtering code located?

I have looked at vaadin-grid-filter-behavior.html and vaadin-grid-filter.html with no luck.

Should be easy  to hack my own custom solution there.

Sorry for the delay. Built-in filtering of the items array is performed inside vaadin-grid-array-data-provider-behavior.html https://github.com/vaadin/vaadin-grid/blob/master/vaadin-grid-array-data-provider-behavior.html#L119