$ ps -ef | grep containerd root 8723 8715 0 12:26 ? 00:00:01 containerd
If there have many commands with name containerd, the result may let some annoyance.
If you want to know the full path of the process, can do this:
$ ls -al /proc/8723/exe lrwxrwxrwx 1 root root 0 Feb 14 12:26 /proc/8723/exe -> /usr/local/bin/containerd