lib/air/parent.js
function parent(/*selector*/) {
  var arr = [], $ = this.air, slice = this.slice;
  this.each(function(el) {
    arr = arr.concat(slice.call($(el.parentNode).dom));
  });
  return $(arr);
}
function parent(/*selector*/) {
  var arr = [], $ = this.air, slice = this.slice;
  this.each(function(el) {
    arr = arr.concat(slice.call($(el.parentNode).dom));
  });
  return $(arr);
}
function parent ( /*selector*/ ) { var arr = [ ] , $ = this . air , slice = this . slice ; this . each ( function ( el ) { arr = arr . concat ( slice . call ( $ ( el . parentNode ) . dom ) ) ; } ) ; return $ ( arr ) ; }
Get the parent of each element in the current set of matched elements,
optionally filtered by a selector.

TODO: implement selector filtering
Get the parent of each element in the current set of matched elements optionally filtered by a selector .