What is a good example to differentiate between fileprivate and private in Swift3

Question

This article has been helpful in understanding the new access specifiers in Swift 3. It also gives some examples of different usages of fileprivate

Answer 1

I just draw a diagram about private, fileprivate, open and public

Hope it can quickly help you , for text description please refer to Martin R 's answer

[ Update Swift 4, 5 ]