digraph stack
{
  compound=true;
  rankdir="LR";
  node [
    shape="box";
  ]

  subgraph cluster_2 {
	  label="Kernel";
	  event0 [label="/dev/input/event0"]
	  event1 [label="/dev/input/event1"]
  }

  subgraph cluster_0 {
	  label="X server process";
	  subgraph cluster_1 {
		  label="xf86-input-libinput"
		  libinput;
	  }
  }

  libinput;
  client [label="X11 client"];

  event0 -> libinput;
  event1 -> libinput;
  libinput -> client [ltail=cluster_0 label="X protocol"];
}