I figured it out. Here is the function that I put inside the Jquery UI slider object:
$("#slider").slider({
stop: function(event){
var p = tl.progress();
var intervals = [0,.9,.18,.27,.36,.45,.54,.63,.72,.81,.9];
var closest = intervals.reduce(function(prev, curr) {
return (Math.abs(curr - p) < Math.abs(prev - p) ? curr : prev);
});
if ( p != intervals) {
tl.progress(closest);
}
event.stopPropagation();
}
});
Snapping awesome!! Thanks!!