Maximum number of unique volumes managed by the CSI driver that can be used on a node.
A volume that is both attached and mounted on a node is considered to be used once, not twice.
The same rule applies for a unique volume that is shared among multiple pods on the same node.
If this field is nil, then the supported number of volumes on this node is unbounded.
VolumeNodeResources is a set of resource limits for scheduling of volumes.