snapshot management tool implementation

I want to implement a command-line tool that allows me to take snapshots of the filesystem for linux/unix systems. I know there are various ways to implement snapshot Copy-On-Write Redirect-On-Write Log File architecture Split mirror I think these are by which various file systems allow snapshots. I don’t know how to implement a tool that interacts with the file systems of a device to create and manage snapshots. I found this tool http://snapper.io/documentation.html but couldn't understand how this works. It would also be helpful if someone could share references to relevant literature.