You can write your own code which queries the prometheus API and does
whatever you like with the data.
PromQL can't do what you're asking, because in general it is not sensible
for processing timeseries. The *definition* of a timeseries is a
collection of values with a unique set of labels. All those things are
unique timeseries; it doesn't matter whether the values happen to be the
same or not.
If I were in your situation, what I would do is to see if I could fix the
vmware exporter to include a filesystem type, like node_exporter has:
node_filesystem_size_bytes{device="lxcfs", fstype="fuse.lxcfs",
instance="nuc1", job="node", mountpoint="/var/lib/lxcfs",
netbox_type="device"} => 0 @[1583914742.097]
node_filesystem_size_bytes{device="tmpfs", fstype="tmpfs", instance="nuc1",
job="node", mountpoint="/run", netbox_type="device"} => 824844288
@[1583914742.097]
node_filesystem_size_bytes{device="tmpfs", fstype="tmpfs", instance="nuc1",
job="node", mountpoint="/run/lock", netbox_type="device"} => 5242880
@[1583914742.097]
...
This can easily be filtered on device and/or fstype.
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