The Oracle of Omaha appreciates high-quality companies, but only if the price is right.Through Berkshire Hathaway, Warren Buffett owns dozens of stocks across various industries. But there's one thriving business in a sector he's familiar with that the conglomerate doesn't have a stake in.That company is Chipotle Mexican Grill (CMG 0.39%). Its shares have skyrocketed 348% in the past five years (as of June 26), easily beating the broader S&P 500. Credit goes to the business's strong fundamental performance. ...