public static FSRLRoot nestedFS(FSRL containerFile, String fstype) {
		if (containerFile instanceof FSRLRoot) {
			throw new RuntimeException("Can't make nestedFS with FSRLRoot path: " + containerFile);
		}
		return new FSRLRoot(containerFile, fstype);
	}
Creates a {@link FSRLRoot} as a child of a container {@link FSRL}, using the supplied
{@code protocol} string as its type.

@param containerFile {@link FSRL} of the container that contains this nested filesystem.
@param fstype the filesystem type.
@return new {@link FSRLRoot} instance with a parent pointing to the specified containerFile.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FSRLRoot.java