Programmatically get linked clone chain length

Hi

I want to get the chain length of VMs and am struggling to find where in an API or even existing web tool this property is exposed.

I tried http://velemental.com/2012/05/05/unofficial-vmware-vcd-cmdlets/

Get-CIVMDiskFileChain  but this did not work.

In the Get-CICM object there is an ExtensionData->Link but i can't find any documentation on this.

Context: VCD 5.51 and vCenter v5.51

Thanks in advance