The labneh here can be used as described for cucumber bites, or simply as a dip.
In a medium bowl, mix the labneh with the salt, pepper, mint salt, and lemon juice. Gently stir in the scallions and olives. Taste and adjust seasonings.
Pat the cucumber slices dry with a paper towel. Place about a teaspoon of the labneh mixture on each slice of cucumber, and top each with a couple of pine nuts.