src/vs/workbench/services/search/node/fileSearch.ts/FileWalker/realPathIfNeeded
class FileWalker:	private realPathIfNeeded(path: string, lstat: fs.Stats, clb: (error: Error | null, realpath?: string) => void): void {
		if (lstat.isSymbolicLink()) {
			return fs.realpath(path, (error, realpath) => {
				if (error) {
					return clb(error);
				}

				return clb(null, realpath);
			});
		}

		return clb(null, path);
	}