Meteor: how to access parent properties within nested templates?

gistfile1.js

Template.nestedTemplate.events({
    'click a.class':function(event,template){
        var parentID = template.data._id;
        console.log(parentID);
    }
});
//http://stackoverflow.com/questions/13091914/meteor-how-to-access-parent-properties-within-nested-templates