FAM
The File Alteration Monitor (FAM) daemon is used by desktop environments such as GNOME and Xfce to monitor and report changes to the filesystem. FAM is also used by the Samba server daemon. Note that KDE no longer uses FAM, they have moved to the kernel-based inotify which requires no special configuration.
Installation
FAM has been removed from the official repository as it is considered deprecated. You can install FAM from Arch User Repository (AUR).
Configuration
A fam.service
unit is provided, see systemd for details.