Split by variable in a specific group using dplyr

stackoverflow! How can I both split and duplicate dataframe using dplyr? Just imagine, that I have got a data frame with grouping variable (i.e. group), sample id (i.e. sample) and value.

library(tidyverse)

df <- tibble(group = c(rep(LETTERS[1:3], 3), "mix", "mix"),
       sample = paste0("sample", seq(1, 11)),
       value = rnorm(11, 20, sd = 30))

I need to split this dataframe into two more dataframes by mix group and sample from this group. First group will be all dataframe without sample11 row, second — without sample10 row. Something like this but more modern way. I believe there's a function for this)

list(
  df1 = df %>% filter(sample != "sample10"),
  df2 = df %>% filter(sample != "sample11")
)

I need to do it for a tens of target samples and then map a function for every df.