diff --git a/docker-inheritance b/docker-inheritance
new file mode 100755
index 0000000..1d471ab
--- /dev/null
+++ b/docker-inheritance
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Usage example:
+# docker-inheritance ~/git ~/docker ~/svn -name ca -prune -o -name node_modules -prune -o -name suisseid3 -prune -o | dot -Tpng > /tmp/inheritance.png; gwenview /tmp/inheritance.png
+
+(
+    echo "digraph G {"
+    for df in $(find $* -name 'Dockerfile' -print); do
+        p=${df%/Dockerfile}
+        n=mwaeckerlin/${p##*/}
+        sed -n 's,^FROM *\([^:]*\).*,"\1" -> "'"$n"'",gp' $df
+    done | sort | uniq
+    echo "}"
+)
+
diff --git a/docker-prune b/docker-prune
index 5a154f9..a8fe4f3 100755
--- a/docker-prune
+++ b/docker-prune
@@ -129,8 +129,10 @@ trap 'traperror "$? ${PIPESTATUS[@]}" $LINENO $BASH_LINENO "$BASH_COMMAND" "${FU
 
 if test -z "$filter"; then
     run docker container prune -f
+    run docker volume prune -f
     run docker image prune -a -f
 else
     run docker container prune -f --filter "$filter"
+    run docker volume prune -f
     run docker image prune -a -f --filter "$filter"
 fi