filter(callback) doesn't work like it should

http://docs.jquery.com/API/1.1a/DOM/Traversing#filter.28_filter_.29

example:

HTML

<div id="container">

<div class="searchable">100</div>

<div class="searchable">101</div>

<div class="searchable">110</div>

<div class="searchable">111</div>

</div>

javascript:

$('#container .searchable').filter(function() {return true;})

$('#container .searchable').filter(function() {return false;})

both return every .searchable element.