LONDON, May 11 (Reuters) - Australian banker Lex Greensill on Tuesday said he was sorry over the collapse of his supply-chain finance firm Greensill Capital, and that he took full responsibility for its failure. “I am truly sorry,” Greensill told a parliamentary committee investigating the collapse. “Please understand that I bear complete responsibility for the collapse of Greensill Capital.” (Reporting by Guy Faulconbridge, writing by William James) Our Standards: The Thomson Reuters Trust Principles.