How can I filter items with a certain enchantement? [duplicate]

I am trying to build a custom Adventure Island. At this moment I am trying to limit the allowed items on this island. I'm trying to do this by filtering on a certain enchantment which is not item-specific.

For example.

When you want to filter an wooden sword with a custom name, you use this command:

/testfor @p[r=5] {Inventory:[{tag:{display:{Name:"Custom Sword"}}}]} <

When you want to filter a wooden sword with a custom name and specific enchantement, you can use:

/testfor @p[r=5] {Inventory:[{tag:{display:{Name:"Custom Sword"},ench:[{id:16,lvl:1}]}}]} <

But how can I filter on items with a specific enchantment on ANY item? I tried:

/testfor @p[r=5] {Inventory:[{tag:{ench:[{id:16,lvl:1}]}}]} <

But this ain't work. Does anyone know how to solve this issue?