Back in March, around the time of the Galaxy S7's launch, users were upset to find that their devices (albeit US models) did not have an unlockable bootloader. And while that still remains true to this day, there is now a root method that works with the Snapdragon 820 variants of the model. More specifically, the root method was designed for the AT&T Galaxy S7 edge variant with the model number SM-G935A, but it is reportedly working with the non-edge model on both AT&T and T-Mobile models. Sprint and Verizon models are supposed to work, but no users have yet reported that it...
Source: http://www.gsmarena.com/snapdragons7variantsrooted-news-19194.php