)</h3>
<p>Gets the filter function for this data layer.</p>
<p><em>Example</em>:</p>
<pre><code>var featureLayer = L.mapbox.featureLayer(geojson)
    // hide all markers
    .setFilter(function() { return false; })
    .addTo(map);

// get the filter function
var fn = featureLayer.getFilter()
</code></pre><p><em>Returns</em> the filter function.</p>
<h3 id="section-featurelayer-setgeojson">featureLayer.setGeoJSON(geojson)</h3>
<p>Set the contents of a markers layer: run the provided
features through the fil