Asian shares got off on the back foot on Friday, on track for a weekly loss, following Wall Street lower as caution reigned ahead of U.S. employment data that may help determine whether the Federal Reserve could raise interest rates as early as next month. MSCI’s broadest index of Asia-Pacific shares outside Japan was down 0.3 percent in early trading, down about 1.6 percent for the week, after U.S. equities logged solid losses in the wake of disappointing earnings results.