title: iOS Push Notifications to specific user in the same deviceToken
body: <p>I am using Urban Airship to test push notification and it went well.</p>
  
  <p>My problem is how do I specify which user to get the notification not just the device token.</p>
  
  <p>I mean in some situations where one device has multiple users, so many users registered the same device token to server.</p>
  
  <p>Or do I have to do the filter on the device (client side) itself?</p>