* a partition /dev/disk2s2 whose content is made into a synthesized /dev/disk3, itself containing some partitions
* which are mounted. /dev/disk2s2 is not considered to be mounted, in this case. So we need to know that
* disk2s2 is related to disk3 so we can consider disk2s2 as mounted if any parts of disk3 are. In order to do
* a partition /dev/disk2s2 whose content is made into a synthesized /dev/disk3, itself containing some partitions
* which are mounted. /dev/disk2s2 is not considered to be mounted, in this case. So we need to know that
* disk2s2 is related to disk3 so we can consider disk2s2 as mounted if any parts of disk3 are. In order to do