public int getNestingDepth() {
		int depth = 0;
		FSRLRoot root = getFS();
		while (root != null) {
			depth++;
			root = root.hasContainer() ? root.getContainer().getFS() : null;
		}
		return depth;
	}
Returns the number of {@link FSRLRoot}s there are in this {@link FSRL}.
<p>
A single level FSRL such as "file://path" will return 1.<br>
A two level FSRL such as "file://path|subfs://path2" will return 2.<br>
etc.<br>

@return number of levels in this FSRL, min value returned is 1.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FSRL.java