How to increase or decrease the capabilities of the current process in golang?

I use the toolkit github.com/syndtr/gocapability in golang to change the capabilities of the current process. The information obtained through the caps.String() function shows that the capablilities have changed.

The code link: https://play.golang.org/p/SkJYyNeFrW0

But in fact it doesn’t. For example, I want to create a new file in the /dev folder (it doesn’t make sense to do so, it’s just an experiment),and then I didn’t get the permissions. It can also be seen from the information in /pro/pid/status that capablilities has not changed. How to increase or decrease the capabilities of the current process in golang? Is there any other method or package?