CALGARY — Suncor Energy Inc. falling victim to a cyberattack may be the most significant cybersecurity breach of an oil and gas company thus far in Canadian history, experts say. CALGARY — Suncor Energy Inc. falling victim to a cyberattack may be the most significant cybersecurity breach of an oil and gas company thus far in Canadian history, experts say. The Calgary-based oil company has provided no details about the attack or which parts of its operations were affected, saying simply in a news release issued late Sunday that it had "experienced a cybersecurity incident." The confirmation followed days of…