Question: Who directed beretta's island starring Franco Columbu?

Context paragraphs:
Texas, Adios: Texas, Adios (Italian: "Texas, addio") is a 1966 Italian Spaghetti Western film directed by Ferdinando Baldi and starring Franco Nero.  It is often referenced in connection with "Django", also starring Nero, and although was referred to as "Django 2" in some countries, it is not considered a sequel.  The film is mostly remembered as a lesser known Spaghetti Western.

Franco Columbu: Francesco Columbu (born in Ollolai, Sardinia, August 7, 1941) is an Italian actor, author, former champion bodybuilder and "World's Strongest Man" competitor.

Detective Belli: Detective Belli (Italian: Un Detective ) is a 1969 Italian crime film directed by Romolo Guerrieri and starring Franco Nero.  The 1973 sequel, also starring Nero is entitled "La polizia incrimina la legge assolve" the English title was "Streets of Eternity"

1981 Mr. Olympia: The 1981 Mr. Olympia contest was an IFBB professional bodybuilding competition held on October 10, 1981, at the Veterans Memorial Auditorium in Columbus, Ohio.  Following the 1980 Mr. Olympia controversy, a number of favored bodybuilders boycotted the event, including Frank Zane, Mike Mentzer, and Boyer Coe.  Franco Columbu followed Arnold Schwarzenegger's suit (1980 Mr Olympia) and came out of retirement for a one time appearance and won the Olympia.

Piedino il questurino: Piedino il questurino (Italian for "Littlefoot the policeman") is a 1974 criminal comedy film directed by Franco Lo Cascio and starring Franco Franchi.  It is a parody of Steno's "Flatfoot".

Pumping Iron: Pumping Iron is a 1977 docudrama about the world of professional bodybuilding, with a focus on the 1975 IFBB Mr. Universe and 1975 Mr. Olympia competitions.  Directed by George Butler and Robert Fiore, it is inspired by a book of the same name by Butler and Charles Gaines, and nominally centers on the competition between Arnold Schwarzenegger and one of his primary competitors for the title of Mr. Olympia, Lou Ferrigno.  The film also features segments on bodybuilders Franco Columbu and Mike Katz, in addition to appearances by Ken Waller, Ed Corney, Serge Nubret, and other famous bodybuilders of the era.

Beretta's Island: Beretta's Island is a 1993 film directed by Michael Preece and starring Franco Columbu.

Massacre Time: Massacre Time (Italian: "Le colt cantarono la morte e fu... tempo di massacro", lit.  "The Colt sang death and it was... Massacre Time"), is a 1966 Italian Spaghetti Western film starring Franco Nero and George Hilton.  It was theatrically distributed in the United States in 1968 as The Brute and the Beast.  It is noteworthy as the first of a very few Westerns directed by horror icon Lucio Fulci.

The Hustler of Muscle Beach: The Hustler of Muscle Beach is a 1980 comedy film that originally aired on ABC-TV.  The film stars Richard Hatch as a get-rich-quick schemer who stages a bodybuilding competition at Muscle Beach in Venice, California.  The film included performances by several professional bodybuilders, including Franco Columbu and Frank Zane, and also co-starred Kay Lenz and Jeanette Nolan.

Sardinia Kidnapped: Sardinia Kidnapped (Italian: "Sequestro di persona" , lit.  "Kidnapped"), also known as Ransom in Sardinia, Island of Crime and Unlawful Restraint, is a 1968 Italian poliziotteschi film directed by Gianfranco Mingozzi and starring Franco Nero, Charlotte Rampling and Frank Wolff.

Supporting paragraphs: Beretta's Island Franco Columbu
Answer: Michael Preece