Visual feedback for restricting drag and drop in a list

I have a table with a list of items. Users are able to drag and drop each item up and down to reorder the items.

I want to set some control in place. For example, in the table below, I want to disable the user from dragging the item 'lime' before 'apple'.

I'm looking for visual examples of immediate feedback that indicates that you're not allowed to drag an item to somewhere, thank you!