https://www.projectatomic.io/blog/2015/07/what-are-docker-none-none-images/
Reference: https://www.projectatomic.io/blog/2015/07/what-are-docker-none-none-images/
这条命令会自动清除无用的none镜像。
Clean Docker <none>:<none>
原文：https://www.cnblogs.com/yaos/p/9738040.html
