If pork is tied, remove strings or netting. Place pork in 3- to 4-quart slow cooker. Sprinkle with Greek seasoning. Cover and cook on low heat setting 8 to 10 hours. Meanwhile, mix mayonnaise and garlic in small bowl. Refrigerate until ready to use. Remove pork from cooker; place on cutting board. Shred pork, using 2 forks. Return pork to cooker and mix well. Spread 2 tablespoons garlic mayonnaise on each pita fold bread. Top each with 1/4 cup shredded pork, cucumber and tomato.