How would I use this for my use case

[walksanatora]

how could Imake a FTP server where I can do things like
user computer32 logs in with a password at /home/ftp/computer/32/.ftppasswd and gives them access to only /home/ftp/computer/32
user computer16 logs in with a password at /home/ftp/computer/16/.ftppasswd and gives them access to only /home/ftp/computer/16
user disk32 logs in with a password at /home/ftp/disk/32/.ftppasswd and gives them access to only /home/ftp/disk/32
because when I look through crates.io all I can see if FTP clients