Does iOS 7 And iOS 6 have Different Versions Of The Same App on app store?

I have an iphone app that was accepted in the App Store before the arrival of iOS 7. The app used to support both iOS 5 and iOS 6.

Now i have updated the same app to iOS 7 and about to submit it to the App Store for approval. I have a question that is making me confuse.

Question : Is there any way the first version of the app stays in the App Store for iOS 5 and iOS 6 users while the new version that i am going to submit only serves the iOS 7 users. In other words, i want to save some time but not updating the same app compatible with the old versions.

I got this question from here.

http://stackoverflow.com/questions/19178844/ios-7-and-ios-6-different-versions-o f-the-same-app.

People says Yes. But it not mention anywhere in Apple documentation. Is this possible? Suggest me app name that is on app store and doing same.

Thank you.