Can this Apple Digital A/V cable be used to play video files tapped from a NAS (Network Access) Drive?

I am trying to find a way to play video home movies saved on a NAS drive and played on my Iphone 4 (via an app), to be viewed on a TV. I learned that just hooking a cable from the iphone to tv only plays movies saved on the internal memory of the Iphone, not from a separate drive.
Does this cable allow movie files to be played on a tv from a NAS drive? The description says the unit can "mirror" any video that is playing on the Iphone.

Apple 30-pin Digital AV Adapter

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