VMWARE probe, how is the Guestdisk freepsace computed

Document ID : KB000113721
Last Modified Date : 13/09/2018
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How does the VMWARE probe is computing the GuestDisk//var/db_dump free space and where are the numbers taken from?
uim 8.5.1
vmware probe 7.11
ESX 5.5
VM Linux redhat 6.8
The probe uses the Managed Object Browser, which is a separate API designed specifically for other applications to grab metrics from the VMware instance. The probe grabs metrics straight from the MOB. 
You can fiund information's via https://<ip>/mob 
The data's given by VMware probe are the same as the information given by https://<ip>/mob 

Please go to https://<IP>/mob 
login is needed 
press content 
press ha-folder-root 
press ha-data-center 
press ha-folder-vm 
next to childentity press on the number for your VM press on guests press on disk 

that should bring up the GuestDiskInfo 
capacity long 64317550592 
diskPath string "C:\" 
dynamicProperty DynamicProperty[] Unset 
dynamicType string Unset 
freeSpace long 28552278016 

The formular would be freeSpace / capacity * 100 

That is the value the probe is getting its information and not from the any linux command. 
Additional Information:
This youtube video is walk through the mob