vss: Add volume filtering

Add options to exclude all mountpoints and arbitrary volumes from snapshotting.

internal/fs/vss.go

@@ -33,10 +33,16 @@ func HasSufficientPrivilegesForVSS() error {
 	return errors.New("VSS snapshots are only supported on windows")
 }
 
+// GetVolumeNameForVolumeMountPoint clear input parameter
+// and calls the equivalent windows api.
+func GetVolumeNameForVolumeMountPoint(mountPoint string) (string, error) {
+	return mountPoint, nil
+}
+
 // NewVssSnapshot creates a new vss snapshot. If creating the snapshots doesn't
 // finish within the timeout an error is returned.
 func NewVssSnapshot(
-	_ string, _ time.Duration, _ ErrorHandler) (VssSnapshot, error) {
+	_ string, _ time.Duration, _ VolumeFilter, _ ErrorHandler) (VssSnapshot, error) {
 	return VssSnapshot{}, errors.New("VSS snapshots are only supported on windows")
 }