@Override
	public String toString() {
		return "SingleFileSystemIndexHelper for " + rootDir.getFilesystem();
	}
Mirrors {@link GFileSystem#lookup(String)} interface.

@param baseDir starting directory 
@param path path and filename of a file to find (either "/" for root or the payload file's
path).
@param nameComp optional {@link Comparator} that compares file names.  Suggested values are 
{@code String::compareTo} or {@code String::compareToIgnoreCase} or {@code null}.
@return {@link GFile} instance or null if requested path is not the same as
the payload file.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/SingleFileSystemIndexHelper.java