French (?) movie with grey men stealing Time Flowers...... Ring any bells??

Hi, I'm after the name of a film, possibly French, main character is a little girl with a tortoise as a pet, she gets chased by grey men in suits who steal people's "time flowers" and then smoke them. In one of the final scenes they are chasing her through a tunnel but the faster they go in the car the slower they approach her, and she gets away by taking really small slow steps. Saw this as a little kid 20 years ago and it stuck with me.... Cheers

placeholder text for bug in Chrome