Apple's website parallax effect

Question

I recently saw the "Design" page of Apple's presention of the iPhone 6S. They used a "parallax effect" for each of the iPhones. I know there are already existing parallax plugins available but Apple has that smooth effect that even works with "jerky" mouse knob. I really want to imitate that effect.

Here's the link Apple iPhone 6S / Design

Solution

OK, so I just found this perfect parallax scrolling plugin Skrollr and it's perfect.