Ignore autofs too.

--- plugins/node.d.freebsd/df.in.orig	2020-03-24 12:31:00 UTC
+++ plugins/node.d.freebsd/df.in
@@ -22,7 +22,7 @@ if [ "$1" = "autoconf" ]; then
 	exit 0
 fi
 
-EXCLUDEDFS="-t noprocfs,devfs,fdescfs,linprocfs,linsysfs,sysfs,nfs,nullfs,cd9660"
+EXCLUDEDFS="-t noprocfs,devfs,fdescfs,linprocfs,linsysfs,sysfs,nfs,nullfs,cd9660,autofs"
 
 if [ $(uname -s) = "GNU/kFreeBSD" ]; then
 	# Debian ships df from GNU coreutils