Using hide() on imported SVG

[brandondurham]

I'm not sure why, but hide() is only working for me with one group in an imported SVG, and I can't figure out why. Here is a Fiddle: http://jsfiddle.net/brandondurham/qayukuzb/

At the bottom of the JS pane I'm adding hide() to all three level 1 groups in the imported SVG, but only the top-most group (nodes) is actually being hidden.

Any idea why?