title: How to run a geo "nearby" query with firestore?
body: <p>Does the new firestore database from firebase natively support location based geo queries?  i.e. Find posts within 10 miles, or find the 50 nearest posts?</p>
  
  <p>I see that there are some existing projects for the real-time firebase database, projects such as geofire- could those be adapted to firestore as well?</p>