Website Testing - Do I need to pay attention to minor version difference

Questions keep coming up as I want to achieve a good browser/OS coverage:

1. Minor browser version change: For instance, most people use Chrome 56, 57 and 58, then do I need to do end-to-end test against each of them?

2. Minor OS version change: similar topic, for a given browser version, do I need to test against Windows 7, Windows 8 and Windows 10 separately?