$ pkaction|grep mount
org.freedesktop.udisks.filesystem-mount
org.freedesktop.udisks.filesystem-mount-system-internal
org.freedesktop.udisks.filesystem-unmount-others

$ pkaction  --action-id org.freedesktop.udisks.filesystem-mount --verbose
org.freedesktop.udisks.filesystem-mount:
  description:       Mount a device
  message:           Authentication is required to mount the device
  vendor:            The udisks Project
  vendor_url:        http://udisks.freedesktop.org/
  icon:              drive-removable-media
  implicit any:      no
  implicit inactive: no
  implicit active:   yes